【作者】 徐正强；

【导师】 唐文勇；

【作者基本信息】 上海交通大学 ， 工程力学， 2010， 硕士

【摘要】 随着现代化工业进程的发展,油气资源的消耗需求越来越大,能源已成为制约我国经济发展的一个关键因素。我国南海蕴藏着丰富的油气资源,但由于水深限制尚未得到很好地开发利用。加快我国南海深水油气开发,对我国经济发展至关重要。作为深水油气勘探开采设备的关键组成部分,深海立管系统在钻井、采油等作业方面起着不可或缺的作用。深海立管由于其细长的结构特点,在各种复杂环境载荷的作用下极易发生失效情况。立管一旦损坏,不仅会造成很大的经济损失,还可能由于油气泄露引起严重的次生灾害,因此立管结构安全性一直是深水油气资源开发项目研究的重点。关于海洋立管的设计,规范一般只考虑百年一遇海况下的极端情况。因此,对于我国南海可能出现的超过百年一遇下的灾害性海况,需要进行相应强度计算以评估该海域平台立管的结构安全性。本文首先借助挪威船级社的DeepC软件,进行全系统耦合分析获得浮式平台在灾害海况下的运动响应,然后通过软件ABAQUS建立深海立管的有限元分析模型,考虑平台随机运动以及波浪、流等环境载荷的联合作用,计算深海立管在灾害海况下的随机结构动力响应,最后根据广义极值理论对随机结果数据进行极值提取拟合,并与相应规范中的许用应力进行比较,完成立管在灾害海洋环境下的安全性评估。更多还原

【Abstract】 With the development of modern industrial processes, the consumption of oil and gas resources has become more and more heavy, which would be a key issue that constrains China’s economic development. In South Sea of China, there are rich reserves of oil and gas that haven’t been well exploited and utilized due to the limitation of water depth. Hence, speeding up the deepwater exploitation of resources in China’s South Sea is of vital importance to the economic development of China.As a key component of deep-sea mining equipments, the riser system plays an indispensable role in drilling and transporting oil/gas. However, due to its slender structural feature, the failure of deep-sea riser can easily occur under the actions of various complex environmental loads. Once the riser is damaged, it will cause not only great economic losses but also serious secondary disasters due to gas/oil leak. So the safety of the riser has always been one of the study focuses of deep-water resource development projects.About the design of the marine riser, generally, only sea conditions with a return period of not more than 100 years will be taken into account in relevant rules. Considering the disastrous marine environment with a return period of more than 100 years which may occur in the south sea of china, a direct strength calculation will be needed to assess the structural safety of the deep-sea riser.In this paper, first, the movement response of the floating platform in disastrous marine environments is obtained through the full coupling analysis method by software DeepC of DNV, and then the random dynamic response of the deep-sea riser is analyzed by ABAQUS with the joint actions of environmental loads taken into account. Furthermore, the random result data is fitted based on the generalized extreme value theory and then compared with the allowable stress given in relevant rules. Finally, the safety assessment of the deep-sea riser in disastrous marine environments is achieved.更多还原